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Influenza polymerase

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https://www.readbyqxmd.com/read/29348862/digital-gene-expression-analysis-in-mice-lung-with-coinfection-of-influenza-and-streptococcus-pneumoniae
#1
Jun Luo, Linlin Zhou, Hongren Wang, Zhen Qin, Li Xiang, Jie Zhu, Xiaojun Huang, Yuan Yang, Wanyi Li, Baoning Wang, Mingyuan Li
Influenza A virus (IAV) and Streptococcus pneumoniae (SP) are two major upper respiratory tract pathogens that can also cause infection in polarized bronchial epithelial cells to exacerbate disease in coinfected individuals which may result in significant morbidity. However, the underlying molecular mechanism is poorly understood. Here, we employed BALB/c ByJ mice inflected with SP, IAV, IAV followed by SP (IAV+SP) and PBS (Control) as models to survey the global gene expression using digital gene expression (DGE) profiling...
December 22, 2017: Oncotarget
https://www.readbyqxmd.com/read/29341100/underdiagnosis-of-influenza-virus-infection-in-hospitalized-older-adults
#2
Lauren Hartman, Yuwei Zhu, Kathryn M Edwards, Marie R Griffin, H Keipp Talbot
OBJECTIVE: To describe factors associated with provider-ordered influenza testing among hospitalized adults. DESIGN: Information on patient demographics, symptoms, and provider-ordered influenza testing were collected by questionnaire and chart review. We conducted prospective laboratory-based surveillance using reverse-transcriptase polymerase chain reaction (RT-PCR), the gold-standard for diagnosis of influenza, to determine how patient characteristics and provider-ordered testing impacted accurate influenza diagnosis...
January 17, 2018: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/29339107/influenza-a-virus-polymerase-an-attractive-target-for-next-generation-anti-influenza-therapeutics
#3
REVIEW
Zhongxia Zhou, Tao Liu, Jian Zhang, Peng Zhan, Xinyong Liu
The influenza RNA-dependent RNA polymerase (RdRP) is conserved among different types of influenza virus, playing an important part in transcription and replication. In this regard, influenza RdRP is an attractive target for novel anti-influenza drug discovery. Herein, we will introduce the structural and functional information of influenza polymerase; and an overview of inhibitors targeting the PA endonuclease and PB2 cap-binding site is provided, along with the approaches utilized for identification of these inhibitors...
January 12, 2018: Drug Discovery Today
https://www.readbyqxmd.com/read/29338047/amino-acid-substitutions-affecting-aspartic-acid-605-and-valine-606-decrease-the-interaction-strength-between-the-influenza-virus-rna-polymerase-pb2-627-domain-and-the-viral-nucleoprotein
#4
Ho-Pan Hsia, Yin-Hua Yang, Wun-Chung Szeto, Benjamin E Nilsson, Chun-Yeung Lo, Andy Ka-Leung Ng, Ervin Fodor, Pang-Chui Shaw
The influenza virus RNA genome is transcribed and replicated in the context of the viral ribonucleoprotein (vRNP) complex by the viral RNA polymerase. The nucleoprotein (NP) is the structural component of the vRNP providing a scaffold for the viral RNA. In the vRNP as well as during transcription and replication the viral polymerase interacts with NP but it is unclear which parts of the polymerase and NP mediate these interactions. Previously the C-terminal '627' domain (amino acids 538-693) of PB2 was shown to interact with NP...
2018: PloS One
https://www.readbyqxmd.com/read/29332597/synthesis-of-a-novel-class-of-1-3-oxathiolane-nucleoside-derivatives-of-t-705-and-evaluation-of-their-anti-influenza-a-virus-and-anti-hiv-activity
#5
Mingming Han, Xu Zhao, Xuedong Wu, Wei Huang, Xingzhou Li, Fang Yu
Backgroud: T-705 (Favipiravir) is a broad spectrum antiviral agent approved for stockpiling in Japan and currently in Phase 3 testing in the United States. Against influenza acts as a prodrug, converted intracellularly to selectively inhibit viral RNA-dependent RNA polymerase or similar enzymes. This is regarded as a novel antiviral mechanism of action, reducing cross-resistance to other existing anti-influenza drugs. OBJECTIVE: To develop new analogs, a class of 1,3-oxathiolane nucleoside derivatives of T-705 were designed and synthesized in this work...
January 11, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29332209/the-rapid-diagnosis-of-viral-respiratory-tract-infections-and-its-impact-on-antimicrobial-stewardship-programs
#6
Şiran Keske, Önder Ergönül, Faik Tutucu, Doruk Karaaslan, Erhan Palaoğlu, Füsun Can
We aimed to describe the potential benefit of new rapid molecular respiratory tests (MRT) in decreasing inappropriate antibiotic use among the inpatients presenting with influenza-like illness (ILI). We included patients from inpatient and outpatient departments who had ILI and performed MRT between 1 January 2015 and 31 December 2016 in a 265-bed private hospital in Istanbul. At the end of 2015, we implemented antimicrobial stewardship including systematic use of MRT. Then, we compared our observations between the year 2015 and the year 2016...
January 13, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29331671/the-molecular-characteristics-of-avian-influenza-viruses-h9n2-derived-from-air-samples-in-live-poultry-markets
#7
Yanheng Wu, Jinsi Lin, Shuhuan Yang, Ying Xie, Man Wang, Xueqin Chen, Yayang Zhu, Le Luo, Wuyang Shi
OBJECTIVE: To study the molecular characteristics of H9N2-subtype avian influenza viruses (AIVs) isolated from air samples collected in live poultry markets (LPMs) and explore their sequence identities with AIVs that caused human infection. METHODS: Weekly surveillance of H9N2-subtype AIVs in the air of LPMs was conducted from 2015 to 2016. H9-positive samples were isolated from chicken embryos. Whole genome sequences of the isolated AIVs were obtained through high-throughput sequencing...
January 10, 2018: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/29329754/comparison-of-cepheid%C3%A2-xpert-flu-and-roche-realtime-ready-influenza-a-h1n1-detection-set-for-detection-of-influenza-a-h1n1
#8
Ali A Rabaan, Ali M Bazzi, Sana A Alshaikh
OBJECTIVE: To compare two influenza polymerase chain reaction (PCR) methods. METHODS: A total of 749 suspected MERS-CoV patients presenting at Johns Hopkins Aramco Healthcare, Saudi Arabia, each submitted a clinical sample for influenza A reflex testing using the on-site Cepheid® Xpert Flu assay and at the Ministry of Health laboratory by the Roche PCR assay. RESULTS: There was 92.12% overall agreement between the two methods. Specificity of the Cepheid® Xpert Flu was 95...
December 16, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29328990/the-amyloidogenicity-of-the-influenza-virus-pb1-derived-peptide-sheds-light-on-its-antiviral-activity
#9
Yana A Zabrodskaya, Dmitry V Lebedev, Marja A Egorova, Aram A Shaldzhyan, Alexey V Shvetsov, Alexander I Kuklin, Daria S Vinogradova, Nikolay V Klopov, Oleg V Matusevich, Taisiia A Cheremnykh, Rajeev Dattani, Vladimir V Egorov
The influenza virus polymerase complex is a promising target for new antiviral drug development. It is known that, within the influenza virus polymerase complex, the PB1 subunit region from the 1st to the 25th amino acid residues has to be is in an alpha-helical conformation for proper interaction with the PA subunit. We have previously shown that PB1(6-13) peptide at low concentrations is able to interact with the PB1 subunit N-terminal region in a peptide model which shows aggregate formation and antiviral activity in cell cultures...
January 8, 2018: Biophysical Chemistry
https://www.readbyqxmd.com/read/29328559/detection-of-influenza-viruses-by-reverse-transcription-polymerase-chain-reaction-who-external-quality-assessment-programme-summary-analysis-2017
#10
(no author information available yet)
No abstract text is available yet for this article.
January 12, 2018: Relevé épidémiologique Hebdomadaire
https://www.readbyqxmd.com/read/29327590/a-simple-strategy-for-rapid-and-sensitive-detection-of-avian-influenza-a-h7n9-virus-based-on-intensity-modulated-spr-biosensor-and-new-generated-antibody
#11
Ying-Feng Chang, Wen-Hung Wang, Yi-Wei Hong, Ruei-Yu Yuan, Kuan-Hsuan Chen, Yu-Wen Huang, Po-Liang Lu, Yen-Hsu Chen, Yi-Ming Arthur Chen, Li-Chen Su, Sheng-Fan Wang
A new reassortant avian influenza A H7N9 virus have emerged in China since 2013, causing human infection with high mortality. An accurate and timely diagnosis is crucial for controlling the outbreaks of the disease. We therefore propose a simple strategy for rapidly and sensitively detecting the H7N9 virus using an intensity-modulated surface plasmon resonance (IM-SPR) biosensor integrated with a new generated monoclonal antibody. The novel antibody exhibits significant specificity to recognize H7N9 virus compared with other clinical human influenza isolates (p<0...
January 12, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29327237/regional-age-and-respiratory-secretion-specific-prevalence-of-respiratory-viruses-associated-with-asthma-exacerbation-a-literature-review
#12
REVIEW
Xue-Yan Zheng, Yan-Jun Xu, Wei-Jie Guan, Li-Feng Lin
Despite increased understanding of how viral infection is involved in asthma exacerbations, it is less clear which viruses are involved and to what extent they contribute to asthma exacerbations. Here, we sought to determine the prevalence of different respiratory viruses during asthma exacerbations. Systematic computerized searches of the literature up to June 2017 without language limitation were performed. The primary focus was on the prevalence of respiratory viruses, including AdV (adenovirus), BoV (bocavirus), CoV (coronavirus), CMV (cytomegalovirus), EnV (enterovirus), HSV (herpes simplex virus), IfV (influenza virus), MpV (metapneumovirus), PiV (parainfluenzavirus), RV (rhinovirus) and RSV (respiratory syncytial virus) during asthma exacerbations...
January 11, 2018: Archives of Virology
https://www.readbyqxmd.com/read/29324680/phylogenetic-analysis-and-characterization-of-a-sporadic-isolate-of-equine-influenza-a-h3n8-from-an-unvaccinated-horse-in-2015
#13
Chithra C Sreenivasan, Sunayana S Jandhyala, Sisi Luo, Ben M Hause, Milton Thomas, David E B Knudsen, Pamela Leslie-Steen, Travis Clement, Stephanie E Reedy, Thomas M Chambers, Jane Christopher-Hennings, Eric Nelson, Dan Wang, Radhey S Kaushik, Feng Li
Equine influenza, caused by the H3N8 subtype, is a highly contagious respiratory disease affecting equid populations worldwide and has led to serious epidemics and transboundary pandemics. This study describes the phylogenetic characterization and replication kinetics of recently-isolated H3N8 virus from a nasal swab obtained from a sporadic case of natural infection in an unvaccinated horse from Montana, USA. The nasal swab tested positive for equine influenza by Real-Time Quantitative Reverse Transcription Polymerase Chain Reaction (RT-PCR)...
January 11, 2018: Viruses
https://www.readbyqxmd.com/read/29321324/influenza-c-and-d-viruses-package-eight-organized-ribonucleoprotein-complexes
#14
Sumiho Nakatsu, Shin Murakami, Keiko Shindo, Taisuke Horimoto, Hiroshi Sagara, Takeshi Noda, Yoshihiro Kawaoka
Influenza A and B viruses have eight-segmented, single-stranded, negative-sense RNA genomes, whereas influenza C and D viruses have seven-segmented genomes. Each genomic RNA segment exists in the form of a ribonucleoprotein complex (RNP) in association with nucleoproteins and an RNA-dependent RNA polymerase in virions. Influenza D virus was recently isolated from swine and cattle, but its morphology is not fully studied. Here, we examined the morphological characteristics of D/bovine/Yamagata/10710/2016 (D/Yamagata) and C/Ann Arbor/50 (C/AA), focusing on RNPs packaged within the virions...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29305549/the-drift-in-molecular-testing-for-influenza-mutations-affecting-assay-performance
#15
Kathleen A Stellrecht
Influenza is associated with rapid evolution due to lack of RNA polymerase proofreading, immunogenic selection and frequent rearrangement of gene segments. Evolutionary changes affecting the performance of diagnostic testing have long been recognized. Hence, it is not surprising that such challenges apply to nucleic acid amplification tests, even though they are designed to target highly conserved regions. Initially, case reports involved single isolates of A(H1N1)pdm09. Over the past four years, subtype H3N2 viruses evolved to viral clades with mutations in the WHO recommended target region, such that almost all isolates worldwide have significantly reduced sensitivities with many commercial PCR tests...
January 5, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29299528/human-clade-2-3-4-4-a-h5n6-influenza-virus-lacks-mammalian-adaptation-markers-and-does-not-transmit-via-the-airborne-route-between-ferrets
#16
Sander Herfst, Chris K P Mok, Judith M A van den Brand, Stefan van der Vliet, Miruna E Rosu, Monique I Spronken, Zifeng Yang, Dennis de Meulder, Pascal Lexmond, Theo M Bestebroer, J S Malik Peiris, Ron A M Fouchier, Mathilde Richard
Since their emergence in 1997, A/H5N1 influenza viruses of the A/goose/Guangdong/1/96 lineage have diversified in multiple genetic and antigenic clades upon continued circulation in poultry in several countries in Eurasia and Africa. Since 2009, reassortant viruses carrying clade 2.3.4.4 hemagglutinin (HA) and internal and neuraminidase (NA) genes of influenza A viruses of different avian origin have been detected, yielding various HA-NA combinations, such as A/H5N1, A/H5N2, A/H5N3, A/H5N5, A/H5N6, and A/H5N8...
January 2018: MSphere
https://www.readbyqxmd.com/read/29297428/bacterial-co-infection-and-early-mortality-among-pulmonary-tuberculosis-patients-in-manila-the-philippines
#17
T Shimazaki, T Taniguchi, N R D Saludar, L M Gustilo, T Kato, A Furumoto, K Kato, N Saito, W S Go, E S Tria, E P Salva, E M Dimaano, C Parry, K Ariyoshi, J B Villarama, M Suzuki
OBJECTIVE: To investigate the prevalence of bacterial co-infection and its effect on early mortality among hospitalised human immunodeficiency virus (HIV) negative pulmonary tuberculosis (PTB) patients in Manila, the Philippines. DESIGN: A prospective observational study was conducted at a national infectious disease hospital. HIV-negative PTB patients aged 13 years hospitalised from November to December 2011 and from December 2012 to May 2013 were enrolled. Sputum samples were tested for Mycobacterium tuberculosis and six respiratory bacterial pathogens using polymerase chain reaction (PCR)...
January 1, 2018: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/29284435/influenza-vaccine-effectiveness-against-influenza-related-hospitalization-during-a-season-with-mixed-outbreaks-of-four-influenza-viruses-a-test-negative-case-control-study-in-adults-in-canada
#18
Melissa K Andrew, Vivek Shinde, Todd Hatchette, Ardith Ambrose, Guy Boivin, William Bowie, Ayman Chit, Gael Dos Santos, May ElSherif, Karen Green, François Haguinet, Scott A Halperin, Barbara Ibarguchi, Jennie Johnstone, Kevin Katz, Joanne M Langley, Jason LeBlanc, Mark Loeb, Donna MacKinnon-Cameron, Anne McCarthy, Janet McElhaney, Allison McGeer, Michaela K Nichols, Jeff Powis, David Richardson, Makeda Semret, Grant Stiver, Sylvie Trottier, Louis Valiquette, Duncan Webster, Lingyun Ye, Shelly A McNeil
BACKGROUND: The Serious Outcomes Surveillance (SOS) Network was established to monitor seasonal influenza complications among hospitalized Canadian adults and to assess the effectiveness of influenza vaccination against severe outcomes. Here we report age- and strain-specific vaccine effectiveness (VE) in preventing severe outcomes during a season characterized by mixed outbreaks of four different influenza strains. METHODS: This prospective, multicentre, test-negative case-control study evaluated the VE of trivalent influenza vaccine (TIV) in the prevention of laboratory-confirmed influenza-hospitalization in adults aged ≥16 years (all adults) and adults aged 16-64 years (younger adults)...
December 29, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29284042/genome-wide-evolutionary-dynamics-of-influenza-b-viruses-on-a-global-scale
#19
Pinky Langat, Jayna Raghwani, Gytis Dudas, Thomas A Bowden, Stephanie Edwards, Astrid Gall, Trevor Bedford, Andrew Rambaut, Rodney Daniels, Colin Russell, Oliver G Pybus, John McCauley, Paul Kellam, Simon J Watson
The global-scale epidemiology and genome-wide evolutionary dynamics of influenza B remain poorly understood compared with influenza A viruses. We compiled a spatio-temporally comprehensive dataset of influenza B viruses, comprising over 2,500 genomes sampled worldwide between 1987 and 2015, including 382 newly-sequenced genomes that fill substantial gaps in previous molecular surveillance studies. Our contributed data increase the number of available influenza B virus genomes in Europe, Africa and Central Asia, improving the global context to study influenza B viruses...
December 28, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/29275668/comparison-of-diagnostic-performance-of-rapid-and-standard-polymerase-chain-reaction-laboratory-test-for-influenza-and-respiratory-syncytial-virus-detection-in-nasopharyngeal-swabs-from-symptomatic-lung-transplant-recipients
#20
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